US-Turkey Cooperative Research: Transfer of Energy from High-Frequency to Low-Frequency Modes in Structures

美国-土耳其合作研究：结构中能量从高频模式到低频模式的转移

• 批准号: 9604966
• 负责人: Ali Nayfeh
• 金额: $ 2万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-15 至 2001-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9604966&HistoricalAwards=false
• 关键词: US; Turkey; Cooperative; Research; Transfer

Description: This award is for support of a cooperative project by Dr. Ali Nayfeh, Professor of Engineering at Virginia Polytechnic Institute and State University, Blacksburg, VA, and Dr. Gunay Anlas, Assistant Professor of Mechanical Engineering at Bogazici University in Istanbul, Turkey. The main objective of this research is to understand the effect of the lamination scheme on the behavior of laminated composite plates under dynamic loads, and the mechanism responsible for the transfer of energy from high-to-low frequency modes. Different composite systems have laminates that are laid on top of each other with different, prescribed, orientation. That difference in orientation alters the properties of the laminate. Energy exchanges in multi-degree-of-freedom systems, from high-to-low frequency modes can be the result of combinations of internal resonances and the interaction between widely-spaced modes. In this project both theoretical and experimental studies are planned. Composite plates with various thickness and lay-ups will be built and tested at VPI&SU. Theoretical studies of the systems will be carried out at Bogazici U. in Istanbul. Exchanges of visits will enable the researchers to better correlate the experimental data to the understanding of the behavior of these materials. Scope: This project will involve an established scientist, with extensive experience in both analytical and experimental mechanics at VPI&SU, with a young Turkish scientist who has demonstrated analytical capability in the same field, and who is particularly familiar with the behavior of that class of materials, namely laminated composites. The combination of facilities and graduate students at VPI&SU with the analytical skills of Dr. Anlas and the support of students and computing facilities at Bogazici University is particularly useful in accomplishing the stated objectives of this project. The American scientist is currently conducting extensive research in this area under a grant from NSF's Division of Civil and Mechanical Systems (CMS), and this international component should enhance the benefit to the US team as well as to the Turkish side. The use of composite materials is growing rapidly in many industries, including the aerospace industry and other, less exotic, industries. The results of this research should help designers select composites that will meet the required criteria for strengths and fatigue resistance. Graduate students from the US and from Turkey are expected to participate in the project. The project fits well with the objectives of the Division of International Programs.

说明：该奖项是为了支持弗吉尼亚州布莱克斯堡的弗吉尼亚理工学院和州立大学工程学教授Ali Nayfeh博士和土耳其伊斯坦布尔Bogazici大学机械工程助理教授Gunay Anlas博士。 这项研究的主要目的是了解层压方案对动态载荷下层压复合板的行为的影响，以及导致能量从高低频率模式转移的机制。 不同的复合系统具有层压板，它们彼此之间彼此之间存在不同的，处方的方向。 方向的差异改变了层压板的特性。 来自高低频率模式的多度自由系统中的能量交换可能是内部共振的组合以及广泛间隔模式之间的相互作用的结果。 在这个项目中，都计划了理论和实验研究。 将在VPI＆SU上建造和测试具有各种厚度和上篮的复合板。 该系统的理论研究将在伊斯坦布尔的Bogazici U.进行。 访问的交流将使研究人员能够更好地将实验数据与对这些材料行为的理解相关联。 范围：该项目将涉及一位既定的科学家，在VPI＆SU的分析和实验力学方面具有丰富的经验，其中一位年轻的土耳其科学家在同一领域表现出了分析能力，并且特别熟悉该类别材料的行为，即层压材料。 VPI＆SU的设施和研究生与Anlas博士的分析技能以及Bogazici University的学生和计算设施的分析技能的结合在实现该项目的既定目标方面特别有用。 美国科学家目前正在该领域的民用和机械系统部（CMS）的赠款下对该领域进行广泛的研究，该国际组成部分应增强对美国团队以及土耳其方面的好处。 在许多行业（包括航空航天行业和其他较少异国行业）中，复合材料的使用正在迅速增长。 这项研究的结果应帮助设计师选择符合优势和抗疲劳性所需标准的复合材料。 预计来自美国和土耳其的研究生将参加该项目。 该项目非常符合国际计划部的目标。